Sinterbonded Drill Bit Components with Tailored Shrink Rates
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Solution Overview
Problem
Conventional drill bits face challenges in performance and durability due to increasing well bore depths, requiring multiple drill bits and time-consuming, costly changes, and existing methods for forming drill bits are limited in improving these aspects.
Innovation Solution
The method involves forming earth-boring rotary drill bits by sinterbonding two or more less than fully sintered components with tailored sinter-shrink rates, allowing them to bond and shrink together to achieve a desired final density, using powder compaction and sintering techniques to create a particle-matrix composite material with enhanced strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional infiltration processes are used to form drill bits, then the manufacturing process is simple, but the strength and durability of the drill bit are insufficient for increasing well bore depths
Solution Approach 1:
The patent uses particle-matrix composite materials where particles (such as diamond, cubic boron nitride, or carbides) are embedded in a matrix material (such as metal, ceramic, or polymer). This composite structure provides both the hardness of particles for cutting and the toughness of the matrix for durability, resolving the contradiction between strength and manufacturing simplicity
Solution Approach 2:
The patent changes the physical and chemical parameters of the material during processing, including temperature, pressure, and composition ratios. By controlling sintering temperature, pressure, and particle distribution, the drill bit achieves optimized strength and durability properties while maintaining manufacturability
2Duration of action of stationary object
If multiple drill bits are required to drill a single well bore, then the drilling task can be completed, but the time and cost for changing drill bits increase
Solution Approach 1:
The patent applies curvature principles in the design of drill bit geometry, including curved cutting edges and optimized bit profiles. This improves cutting efficiency and heat dissipation, allowing the drill bit to maintain performance for longer durations and reducing the frequency of changes required
Solution Approach 2:
The particle-matrix composite structure provides enhanced durability and wear resistance, enabling the drill bit to withstand prolonged use at increasing well bore depths without degradation, thereby extending its service life and reducing change frequency
3Strength
If powder compaction and sintering techniques are used to form drill bits, then the strength and durability are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the drill bit manufacturing into separate stages: forming the bit body using powder compaction, then sintering to bond particles. This segmentation allows each process to be optimized independently, achieving high strength while managing overall manufacturing complexity through process modularity
Solution Approach 2:
The patent controls sintering parameters (temperature, pressure, time, atmosphere) to achieve optimal bonding and density. By precisely managing these parameters, the process produces strong drill bits while maintaining manufacturing feasibility through standardized parameter sets
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in drill bits with improved strength and durability, reducing the need for frequent replacements and enhancing drilling efficiency by creating a strong, cohesive bit body through controlled sintering and porosity manipulation.
Implementation Method 1
The term 'sintering,' as used herein, means the densification of a particulate component and involves removal of at least a portion of the pores between the starting particles, accompanied by shrinkage, combined with coalescence and bonding between adjacent particles
Implementation Method 2
The green body may be compressed (e.g., with substantially isostatic pressure) within a mold or container
Data Source
AI summary
Partially formed earth-boring rotary drill bits comprise a first less than fully sintered particle-matrix component having at least one recess, and at least a second less than fully sintered particle-matrix component disposed at least partially within the at least one recess. Each less than fully sintered particle-matrix component comprises a green or brown structure including compacted hard particles, particles comprising a metal alloy matrix material, and an organic binder material. The at least a second less than fully sintered particle-matrix component is configured to shrink at a slower rate than the first less than fully sintered particle-matrix component due to removal of organic binder material from the less than fully sintered particle-matrix components in a sintering process to be used to sinterbond the first less than fully sintered particle-matrix component to the at least a second less than fully sintered particle-matrix component. Earth-boring rotary drill bits comprise such components sinterbonded together.